SF21 Diode

• Maximum Recurrent Peak Reverse Voltage: 50 V
• Maximum Average Forward Output Current: 2 A
• Maximum Forward Voltage Drop per element at 1.0A DC: 0.95 V
• Maximum reverse recovery time: 35 ns
• Typical Junction Capacitance: 30 pF
• Package: DO-15
• Weight: 1.18 grams
• Operating and Storage Temperature Range: -65...+150 °C

The SF21 diode has a cathode (-) and anode (+). In the schematic symbol, the tip of the triangle with the line on top of it is the cathode. The cathode is marked on the body of a diode by a band as shown below.The current can flow from only the anode to the cathode and never from the cathode to the anode - the SF21 diode is like a one way electric valve.You can replace the SF21 with the SF22, SF23, SF24, SF25, SF26, SF28, SF31, SF32, SF33, SF34, SF35, SF36, SF38